// 封装购物车模块
import { defineStore } from "pinia"
import { computed, ref } from 'vue'
import { useUserStore } from './user'
import { insertCartAPI, findNewCartListAPI, delCartAPI } from '../apis/cart'

export const useCartStore =  defineStore('cart',()=>{
    const userStore = useUserStore()
        //获取最新购物车列表action
    const updateNewList = async ()=> {
        const res = await findNewCartListAPI()
        cartList.value = res.result
    }
    const isLogin = computed(()=>userStore.userInfo.token)
    // 1.定义state
    const cartList = ref([])
    // 2.定义action
    const addCart = async (goods)=>{
        const { skuId, count } = goods
        if(isLogin.value){
            // 登录之后加入购物车
            await insertCartAPI({ skuId, count })
            updateNewList()
        }
        else{
        //添加购物车操作
        //已添加过 count+1
        //没有添加过 直接push
        const item = cartList.value.find((item)=> goods.skuId === item.skuId)
        if(item){
            item.count++
        }
        else{
            cartList.value.push(goods)
        }
        }
    }
    // 删除购物车
    const delCart = async (skuId) =>{
        if(isLogin.value){
            // 调用接口实现接口购物车中的删除功能
           await delCartAPI([skuId])
           updateNewList()
        }else{
            const idx = cartList.value.findIndex((item)=>skuId===item.skuId)
            cartList.value.splice(idx,1)
        }
    }

    //清除购物车
    const clearCart = () => {
        cartList.value = []
    }
    // 单选功能
    const singleCheck = (skuId,selected) => {
        // 通过skuId找到待修改项 然后把他的selected修改成传过来的selected
        const item = cartList.value.find((item)=> item.skuId === skuId)
        item.selected = selected
    }

    // 全选功能
    const allCheck = (selected) =>{
        cartList.value.forEach(item => item.selected = selected)
    }
    // 计算属性
    // 1.总的数量 所有项的count之和
    const allCount = computed(()=>cartList.value.reduce((a,c)=>a+c.count,0))
    // 2.总价 所有项的count*price之和
    const allPrice = computed(()=>cartList.value.reduce((a,c)=>a+c.count * c.price,0))
    const isAll = computed(() => cartList.value.every((item)=>item.selected))
    // 3.已选择数量
    const selectedCount = computed(()=>cartList.value.filter(item => item.selected).reduce((a,c)=>a+c.count,0))
    // 4.已选择商品价钱的合计
    const selectedPrice = computed(()=>cartList.value.filter(item => item.selected).reduce((a,c)=>a+c.count * c.price,0))
 
    return {
        cartList,
        addCart,
        delCart,
        allCount,
        allPrice,
        singleCheck,
        allCheck,
        isAll,
        selectedCount,
        selectedPrice,
        clearCart,
        updateNewList
    }
},{
    persist: true
})